Answer:
He would need 6 red roses and 9 pink daisies to make 3 bouquets.
Explanation:
10 red roses and 15 pink daisies are needed for 5 bouquets. This means he would need 10/5 = 2 red roses and 15/5 = 3 pink daisies for 1 bouquet. This also means that he would need 2(3) = 6 red roses and 3(3) = 9 pink daisies for 3 bouquets.